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(4/5)*x = 6/7 // - 6/7
(4/5)*x-(6/7) = 0
(4/5)*x-6/7 = 0
4/5*x-6/7 = 0 // + 6/7
4/5*x = 6/7 // : 4/5
x = 6/7/4/5
x = 15/14
x = 15/14
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